CN111129435A - Thin film lithium battery and preparation method of interface modification layer - Google Patents
Thin film lithium battery and preparation method of interface modification layer Download PDFInfo
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 52
- 238000012986 modification Methods 0.000 title claims abstract description 44
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
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- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000002243 precursor Substances 0.000 claims abstract description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 3
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- 239000013077 target material Substances 0.000 claims description 22
- 238000001755 magnetron sputter deposition Methods 0.000 claims description 20
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 20
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- 238000001704 evaporation Methods 0.000 claims description 10
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- 239000002994 raw material Substances 0.000 claims description 10
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- 229910032387 LiCoO2 Inorganic materials 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910000572 Lithium Nickel Cobalt Manganese Oxide (NCM) Inorganic materials 0.000 claims description 2
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- 239000004642 Polyimide Substances 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- QTHKJEYUQSLYTH-UHFFFAOYSA-N [Co]=O.[Ni].[Li] Chemical compound [Co]=O.[Ni].[Li] QTHKJEYUQSLYTH-UHFFFAOYSA-N 0.000 claims description 2
- RLTFLELMPUMVEH-UHFFFAOYSA-N [Li+].[O--].[O--].[O--].[V+5] Chemical compound [Li+].[O--].[O--].[O--].[V+5] RLTFLELMPUMVEH-UHFFFAOYSA-N 0.000 claims description 2
- YWJVFBOUPMWANA-UHFFFAOYSA-H [Li+].[V+5].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O Chemical compound [Li+].[V+5].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O YWJVFBOUPMWANA-UHFFFAOYSA-H 0.000 claims description 2
- FBDMTTNVIIVBKI-UHFFFAOYSA-N [O-2].[Mn+2].[Co+2].[Ni+2].[Li+] Chemical compound [O-2].[Mn+2].[Co+2].[Ni+2].[Li+] FBDMTTNVIIVBKI-UHFFFAOYSA-N 0.000 claims description 2
- FDLZQPXZHIFURF-UHFFFAOYSA-N [O-2].[Ti+4].[Li+] Chemical compound [O-2].[Ti+4].[Li+] FDLZQPXZHIFURF-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 claims description 2
- 239000011888 foil Substances 0.000 claims description 2
- 239000010439 graphite Substances 0.000 claims description 2
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 2
- FRMOHNDAXZZWQI-UHFFFAOYSA-N lithium manganese(2+) nickel(2+) oxygen(2-) Chemical compound [O-2].[Mn+2].[Ni+2].[Li+] FRMOHNDAXZZWQI-UHFFFAOYSA-N 0.000 claims description 2
- 239000010445 mica Substances 0.000 claims description 2
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- 238000004519 manufacturing process Methods 0.000 claims 1
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- 229910001386 lithium phosphate Inorganic materials 0.000 description 3
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1397—Processes of manufacture of electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention belongs to the technical field of chemical power supplies, and particularly relates to a preparation method for a thin film lithium battery and an interface modification layer, which comprises the following steps of S1, depositing metal on a substrate as a buffer layer; s2, depositing metal on the buffer layer to serve as a current collector; s3, depositing a positive electrode film on the metal in the S2; placing the deposited positive film in an annealing furnace; s4, adopting an atomic layer deposition technology, taking one or a combination of more of trimethyl aluminum, tetraethoxysilane and titanium tetraisopropoxide as a precursor and deionized water as an oxygen source, depositing an interface modification layer with the thickness of 5-20nm on the surface of the anode film at the reaction temperature of 200 ℃, and coating the surface of the annealed anode film. The interface modification layer of the membrane lithium battery is prepared by adopting an atomic force deposition method, so that the membrane modification layer is compact, tiny cracks formed by the anode thin film in a high-temperature annealing process are modified, the internal short circuit condition of the battery is reduced, and the performance of the battery is improved.
Description
Technical Field
The invention belongs to the technical field of chemical power supplies, and particularly relates to a preparation method for a thin film lithium battery and an interface modification layer.
Background
With continuous progress of informatization and intellectualization, and continuous development of miniaturized devices, internet of things nodes, intelligent dust and wearable electronic products, a miniature power supply with small volume, light weight, high capacity, long cycle life and high safety is urgently needed. The thin film lithium battery has smaller volume, longer service life, better stability and safety as a micro power supply, and has wide application prospect in the fields of military affairs, communication, space and the like. The miniature battery with small size is developed rapidly in the field of micro-electro-mechanical systems (MEMS) and microchip, and is an integrated micro device system, which is composed of components such as a micro sensor, a micro actuator, a signal processing and control circuit, a communication interface, a power supply and the like. Therefore, the power supply system must be integrated on a circuit chip under normal conditions, and miniaturization, thinning, and full solid state of the power supply system are required.
Solid-state secondary batteries are currently an important research direction for chemical power sources due to their high safety, high specific energy, and long life. An all-solid-state thin-film lithium battery is attracting attention as a solid-state secondary battery because of its advantages of small size, light weight, long life, and the like. Kanehori et al developed the first all-solid-state thin-film lithium battery in 1983, and Oak Ridge National Laboratory (ORNL) Bates J B et al developed LiPON in 1993, which has good chemical stability, can resist 5V voltage, and has high ionic conductivity (10)-6S/cm) is the best electrolyte thin film material in all solid state thin film lithium batteries at the time.
The all-solid-state thin-film lithium battery mainly has the following advantages as an energy source: (1) compared with the traditional nickel-cadmium battery, nickel-hydrogen battery, block lithium battery and the like, the lithium battery has higher specific capacity and energy density; (2) can be made into any shape and size, and can be directly integrated in a circuit or on an electronic device; (3) the material has excellent charge-discharge cycle performance, small self-discharge rate and no memory effect; (4) the safety performance is good, and no gas is generated during working; (5) the protective layer is arranged to separate the battery material from the atmospheric environment, and the performance is highly stable; (6) the working temperature range is large, and the method can be applied to many extreme occasions, such as the fields of aviation, aerospace, exploration and the like.
At present, a positive electrode film used for a film lithium battery needs high-temperature annealing treatment to form a crystalline state, and a large number of cracks and holes are formed in the high-temperature annealing process, so that the discharge capacity and the cycle performance of the battery are limited, and internal short circuit is easily formed in the long-term cycle process to cause the damage of the battery. These problems have greatly affected the practical development and application of thin film lithium batteries.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a thin film lithium battery and a preparation method of an interface modification layer. The thin film lithium battery interface modification layer is prepared by adopting an atomic force deposition method, so that the thin film modification layer is compact, tiny cracks formed by the anode thin film in a high-temperature annealing process are modified, the internal short circuit condition of the battery is reduced, and the battery performance is improved.
The degree of internal micro short circuit and cracks is reduced by modifying the anode film of the film lithium battery, so that the discharge capacity and the cycling stability of the battery are improved.
In order to achieve the purpose, the invention adopts the following specific technical scheme:
a preparation method of a thin film lithium battery interface modification layer is provided, wherein the interface modification layer can be one or a combination of more of aluminum oxide, silicon oxide or titanium oxide; the specific preparation process comprises the following steps:
s1, depositing metal on the substrate to serve as a buffer layer, wherein the thickness of the buffer layer is 50-300 nm;
s2, depositing metal on the buffer layer to serve as a current collector, wherein the thickness of the current collector is 50-300 nm;
s3, depositing a positive film on the metal in the S2, wherein the thickness of the film is 500nm-3000 nm; placing the deposited positive electrode film in an annealing furnace, heating at the rate of 2-10 ℃/min, heating from the normal temperature to 500 ℃ and 800 ℃, and keeping the temperature for 0.5-2 h;
s4 atomic layer deposition method, using Trimethylaluminum (TMAI), Tetraethoxysilane (TEOS), titanium tetraisopropoxide (Ti (iPrO)4) One or more of the above-mentioned compounds are combined as a precursorAnd taking the body and deionized water as oxygen sources, depositing an interface modification layer with the thickness of 5-20nm on the surface of the anode film at the reaction temperature of 200 ℃, and coating the surface of the annealed anode film.
Further, the substrate of S1 is one of glass, graphite, a silicon wafer, stainless steel, mica, a titanium foil, an aluminum foil, polyimide, and an oxide ceramic sheet.
Further, the S3 positive electrode thin film is one or more of lithium cobaltate, lithium manganate, lithium nickelate, (lithium) vanadium oxide, lithium iron phosphate, lithium vanadium phosphate, lithium nickel cobalt manganese oxide, lithium titanium oxide, lithium nickel manganese oxide, and lithium nickel cobalt oxide.
Further, the method for preparing the buffer layer in S1 includes: selecting a substrate, adopting a direct current magnetron sputtering method, taking high-purity metal Ti as a target material, sputtering gas as high-purity Ar, working pressure of 0.2Pa, sputtering power of 50W, and sputtering and depositing a metal Ti film as a buffer layer.
Further, the method for preparing a current collector in S2 includes: based on an S1 sample, high-purity metal platinum is used as a target material, the working air pressure is 0.2Pa, the sputtering power is 50W, and a direct-current magnetron sputtering metal platinum film is used as a positive electrode current collector.
Further, the method for depositing the cathode thin film in S3 includes: based on the S2 sample, depositing a positive film by radio frequency magnetron sputtering to obtain high-purity LiCoO2The target material is prepared from high-purity Ar as sputtering gas, the working pressure is 0.3Pa, and the sputtering power is 90W.
Further, the method for depositing the modification layer in S4 includes: and placing the annealed anode film in atomic layer deposition equipment ALD, vacuumizing to 0.2Torr, adjusting the temperature of a chamber to 200 ℃, the temperature of a pipeline to 100 ℃, introducing deionized water vapor for 0.2s, reacting for 30s, vacuumizing for 30s, introducing precursor for 0.1s, reacting for 30s, and vacuumizing for 30s, wherein the process is a cycle, and 30 cycles are circulated.
Furthermore, the invention also discloses a preparation method of the thin film lithium battery, which comprises the steps of sequentially preparing an electrolyte thin film, a negative current collector and a negative electrode on the basis of the modification layer; the specific method comprises the following steps:
step one, continuously sputtering and depositing an electrolyte thin film (LiPON) based on the sample obtained from S4, wherein the thickness of the electrolyte thin film is 0.5-1.5 mu m;
based on the sample obtained in the step one, evaporating and depositing a Li cathode film by taking a high-purity metal Li sheet as a raw material, wherein the thickness of the cathode film is 0.5-1.0 mu m;
and step three, based on the sample obtained in the step two, taking the metal Cu particles as a raw material, and evaporating and depositing the Cu film as a negative current collector to finish the preparation of the miniature all-solid-state film lithium battery.
Further, the method of depositing the electrolyte thin film in the first step includes: high purity Li by radio frequency magnetron sputtering3PO4As target material, the sputtering gas is high-purity N2The working pressure is 0.2Pa, and the sputtering power is 80W.
The invention has the advantages and positive effects that:
according to the invention, the interface modification layer with a certain thickness range is deposited on the surface of the positive electrode film, and reacts with the interface modification layer in the annealing and crystallization process of the positive electrode film, so that the micro appearance of the positive electrode film is improved, and the effect of improving the electrochemical performance of the thin film lithium battery is achieved; the interface modification layer with excellent performance has the advantages of reducing the internal resistance of the thin film lithium battery, reducing internal micro short circuit and improving the specific capacity and the cycle performance of the thin film lithium battery. The interface modification layer and the preparation method thereof have the advantages of easy preparation, large-scale production and the like.
Drawings
FIG. 1 is a surface topography of a thin film lithium battery positive electrode thin film in example 1 of the present invention;
FIG. 2 is a graph showing the charge-discharge capacity and cycle performance of an unmodified thin film lithium battery according to example 1 of the present invention;
FIG. 3 is a surface topography of a modified layer of alumina in example 1 of the present invention;
FIG. 4 is a graph showing the charge/discharge capacity and cycle performance of the modified thin film lithium battery in example 1 of the present invention.
Detailed Description
For a further understanding of the contents, features and effects of the present invention, the following examples are illustrated in the accompanying drawings and described in the following detailed description:
referring to figures 1, 2, 3 and 4:
example 1
A preparation method of a thin film lithium battery interface modification layer comprises the steps of sequentially preparing a buffer layer, a positive current collector, a positive film and a modification layer on a substrate; the specific preparation process comprises the following steps:
s1, using common glass as a substrate, adopting a direct current magnetron sputtering method, using high-purity metal Ti as a target material, sputtering gas as high-purity Ar, working pressure of 0.2Pa and sputtering power of 50W, and sputtering and depositing a metal Ti film as a buffer layer with the thickness of about 50 nm;
s2, based on the S1 sample, taking high-purity metal platinum as a target material, wherein the working air pressure is 0.2Pa, the sputtering power is 50W, and the direct-current magnetron sputtering metal platinum film is used as a positive electrode current collector; the thickness of the current collector is 50 nm;
s3, based on the S2 sample, continuing to perform radio frequency magnetron sputtering deposition on the anode film, and performing high-purity LiCoO2The target material is prepared by sputtering high-purity Ar with the working pressure of 0.3Pa and the sputtering power of 90W and the thickness of 0.5-1.5 mu m, and placing the target material in a muffle furnace to be annealed for 0.5h from the normal temperature to 550 ℃ at the speed of 2 ℃/min;
s4, based on the S3 sample, depositing an interface modification layer film on the surface of the positive electrode film: specifically, the annealed anode film is placed in atomic layer deposition equipment ALD, vacuumized to 0.2Torr, the temperature of a regulating chamber is 200 ℃, the temperature of a pipeline is 100 ℃, deionized water vapor enters air for 0.2s, reaction is carried out for 30s, vacuumizing is carried out for 30s, trimethyl aluminum (TMAI) enters air for 0.1s, reaction is carried out for 30s, vacuumizing is carried out for 30s, the process is a cycle, 30 cycles are carried out, an aluminum oxide modification layer with the thickness of about 5nm is deposited, and the surface of the annealed anode film is coated.
The preparation of the thin film lithium battery comprises the preparation of an electrolyte thin film, a negative current collector and a negative electrode on the basis of the steps, and mainly comprises the following steps:
step one, continuously sputtering and depositing an electrolyte film (LiPON) based on the S4 sample, and adopting a radio frequency magnetron sputtering method to prepare high-purity Li3PO4As target material, the sputtering gas is high-purity N2The working pressure is 0.2Pa, the sputtering power is 80W, and the thickness is about 0.5-1.5μm；
Based on the sample obtained in the first step, evaporating and depositing a Li cathode film with the thickness of about 0.5-1.0 μm by taking a high-purity metal Li sheet as a raw material;
and step three, based on the sample obtained in the step two, taking the metal Cu particles as a raw material, and evaporating and depositing the Cu film as a negative current collector to finish the preparation of the miniature all-solid-state film lithium battery. The prepared miniature all-solid-state thin-film lithium battery adopts a Land battery test system to test the discharge capacity and the cycle performance of the battery, the voltage range is 3V-4.2V, and the current density is 50uA/cm2The test temperature was 25 ℃.
Example 2
A thin film lithium battery and a preparation method of an interface modification layer are provided, the method is that a buffer layer, a positive pole current collector, a positive pole thin film and a modification layer are prepared on a substrate in sequence; the specific preparation process comprises the following steps:
s1, using common glass as a substrate, adopting a direct current magnetron sputtering method, using high-purity metal Ti as a target material, sputtering gas as high-purity Ar, working pressure of 0.2Pa, sputtering power of 50W, and sputtering and depositing a metal Ti film as a buffer layer with the thickness of about 150 nm;
s2, based on the S1 sample, taking high-purity metal platinum as a target material, wherein the working air pressure is 0.2Pa, the sputtering power is 50W, and the direct-current magnetron sputtering metal platinum film is used as a positive electrode current collector; the thickness of the current collector is 150 nm;
s3, based on the S2 sample, continuing to perform radio frequency magnetron sputtering deposition on the anode film, and performing high-purity LiCoO2The target material is prepared by sputtering high-purity Ar with the working pressure of 0.3Pa and the sputtering power of 90W and the thickness of 1.5-2.5 μm, and annealing the target material in a muffle furnace at the temperature of 650 ℃ from normal temperature at the speed of 6 ℃/min for 1 h;
s4, based on the S3 sample, depositing an interface modification layer film on the surface of the positive electrode film: specifically, the annealed anode film is placed in atomic layer deposition equipment ALD, vacuum pumping is carried out until the temperature is 0.2Torr, the temperature of a chamber is adjusted to be 200 ℃, the temperature of a pipeline is 100 ℃, deionized water vapor enters the atmosphere for 0.2s, reaction is carried out for 30s, vacuum pumping is carried out for 30s, tetraethoxysilane enters the atmosphere for 0.1s, reaction is carried out for 30s, vacuum pumping is carried out for 30s, the process is a cycle, 30 cycles are cycled, a silicon oxide modification layer with the thickness of about 15nm is deposited, and the surface of the annealed anode film is coated.
The preparation of the thin film lithium battery comprises the preparation of an electrolyte thin film, a negative current collector and a negative electrode on the basis of the steps, and mainly comprises the following steps:
step one, continuously sputtering and depositing an electrolyte film (LiPON) based on the S4 sample, and adopting a radio frequency magnetron sputtering method to prepare high-purity Li3PO4As target material, the sputtering gas is high-purity N2The working pressure is 0.2Pa, the sputtering power is 80W, and the thickness is about 0.5-1.5 μm;
based on the sample obtained in the first step, evaporating and depositing a Li cathode film with the thickness of about 0.5-1.0 μm by taking a high-purity metal Li sheet as a raw material;
and step three, based on the sample obtained in the step two, taking the metal Cu particles as a raw material, and evaporating and depositing the Cu film as a negative current collector to finish the preparation of the miniature all-solid-state film lithium battery. The prepared miniature all-solid-state thin-film lithium battery adopts a Land battery test system to test the discharge capacity and the cycle performance of the battery, the voltage range is 3V-4.2V, and the current density is 50uA/cm2The test temperature was 25 ℃.
Example 3
A thin film lithium battery and a preparation method of an interface modification layer are provided, the method is that a buffer layer, a positive pole current collector, a positive pole thin film and a modification layer are prepared on a substrate in sequence; the specific preparation process comprises the following steps:
s1, using common glass as a substrate, adopting a direct current magnetron sputtering method, using high-purity metal Ti as a target material, sputtering gas as high-purity Ar, working pressure of 0.2Pa, sputtering power of 50W, and sputtering and depositing a metal Ti film as a buffer layer with the thickness of about 300 nm;
s2, based on the S1 sample, taking high-purity metal platinum as a target material, wherein the working air pressure is 0.2Pa, the sputtering power is 50W, and the direct-current magnetron sputtering metal platinum film is used as a positive electrode current collector; the thickness of the current collector is 300 nm;
s3, based on the S2 sample, continuing to perform radio frequency magnetron sputtering deposition on the anode film, and performing high-purity LiCoO2The sputtering gas is high-purity Ar as a target material, the working pressure is 0.3Pa, and the sputtering work is performedThe rate is 90W, the thickness is about 2.5-3.0 μm, and the annealing furnace is placed in a muffle furnace to be annealed for 2h from the normal temperature to 800 ℃ at the speed of 10 ℃/min;
s4, based on the S3 sample, depositing an interface modification layer film on the surface of the positive electrode film: specifically, the annealed anode film is placed in atomic layer deposition equipment ALD, vacuumized to 0.2Torr, the temperature of a chamber is adjusted to 200 ℃, the temperature of a pipeline is 100 ℃, deionized water vapor is fed for 0.2s, the reaction is carried out for 30s, the vacuumization is carried out for 30s, titanium tetraisopropoxide is fed for 0.1s, the reaction is carried out for 30s, the vacuumization is carried out for 30s, the process is a cycle, 30 cycles are carried out, a titanium oxide modification layer with the thickness of about 20nm is deposited, and the surface of the annealed anode film is coated.
The preparation of the thin film lithium battery comprises the preparation of an electrolyte thin film, a negative current collector and a negative electrode on the basis of the steps, and mainly comprises the following steps:
step one, continuously sputtering and depositing an electrolyte film (LiPON) based on the S4 sample, and adopting a radio frequency magnetron sputtering method to prepare high-purity Li3PO4As target material, the sputtering gas is high-purity N2The working pressure is 0.2Pa, the sputtering power is 80W, and the thickness is about 0.5-1.5 μm;
based on the sample obtained in the first step, evaporating and depositing a Li cathode film with the thickness of about 0.5-1.0 μm by taking a high-purity metal Li sheet as a raw material;
and step three, based on the sample obtained in the step two, taking the metal Cu particles as a raw material, and evaporating and depositing the Cu film as a negative current collector to finish the preparation of the miniature all-solid-state film lithium battery. The prepared miniature all-solid-state thin-film lithium battery adopts a Land battery test system to test the discharge capacity and the cycle performance of the battery, the voltage range is 3V-4.2V, and the current density is 50uA/cm2The test temperature was 25 ℃.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (9)
1. A thin film lithium battery and a preparation method of an interface modification layer are provided, wherein the interface modification layer can be one or a combination of more of aluminum oxide, silicon oxide or titanium oxide; the method is characterized in that: comprises the following steps of (a) carrying out,
s1, depositing metal on the substrate to serve as a buffer layer, wherein the thickness of the buffer layer is 50-300 nm;
s2, depositing metal on the buffer layer to serve as a current collector, wherein the thickness of the current collector is 50-300 nm;
s3, depositing a positive film on the metal in the S2, wherein the thickness of the film is 500nm-3000 nm; placing the deposited positive electrode film in an annealing furnace, heating at the rate of 2-10 ℃/min, heating from the normal temperature to 500 ℃ and 800 ℃, and keeping the temperature for 0.5-2 h;
s4 atomic layer deposition method, using Trimethylaluminum (TMAI), Tetraethoxysilane (TEOS), titanium tetraisopropoxide (Ti (iPrO)4) One or more of the components are used as a precursor, deionized water is used as an oxygen source, the reaction temperature is 200 ℃, an interface modification layer with the thickness of 5-20nm is deposited on the surface of the anode film, and the surface of the annealed anode film is coated.
2. The method of claim 1 for preparing a thin film lithium battery and an interface modification layer, wherein the method comprises: s1 the substrate is one of glass, graphite, silicon chip, stainless steel, mica, titanium foil, aluminum foil, polyimide and oxide ceramic chip.
3. The method of claim 1 for preparing a thin film lithium battery and an interface modification layer, wherein the method comprises: the S3 positive electrode film is one or a combination of more of lithium cobaltate, lithium manganate, lithium nickelate, (lithium) vanadium oxide, lithium iron phosphate, lithium vanadium phosphate, lithium nickel cobalt manganese oxide, lithium titanium oxide, lithium nickel manganese oxide and lithium nickel cobalt oxide.
4. The method of claim 1 for preparing a thin film lithium battery and an interface modification layer, wherein the method comprises: the method for preparing the buffer layer in the S1 includes: selecting a substrate, adopting a direct current magnetron sputtering method, taking high-purity metal Ti as a target material, sputtering gas as high-purity Ar, working pressure of 0.2Pa, sputtering power of 50W, and sputtering and depositing a metal Ti film as a buffer layer.
5. The method of claim 1 for preparing a thin film lithium battery and an interface modification layer, wherein the method comprises: the method for preparing the current collector in the step S2 comprises the following steps: based on an S1 sample, high-purity metal platinum is used as a target material, the working air pressure is 0.2Pa, the sputtering power is 50W, and a direct-current magnetron sputtering metal platinum film is used as a positive electrode current collector.
6. The method of claim 1 for preparing a thin film lithium battery and an interface modification layer, wherein the method comprises: the method for depositing the cathode film in S3 includes: based on the S2 sample, depositing a positive film by radio frequency magnetron sputtering to obtain high-purity LiCoO2The target material is prepared from high-purity Ar as sputtering gas, the working pressure is 0.3Pa, and the sputtering power is 90W.
7. The method of claim 1 for preparing a thin film lithium battery and an interface modification layer, wherein the method comprises: the method for depositing the modification layer in the step S4 comprises the following steps: and placing the annealed anode film in atomic layer deposition equipment ALD, vacuumizing to 0.2Torr, adjusting the temperature of a chamber to 200 ℃, the temperature of a pipeline to 100 ℃, introducing deionized water vapor for 0.2s, reacting for 30s, vacuumizing for 30s, introducing precursor for 0.1s, reacting for 30s, and vacuumizing for 30s, wherein the process is a cycle, and 30 cycles are circulated.
8. A method for preparing a thin film lithium battery, which is to prepare an electrolyte thin film, a negative current collector and a negative electrode on the basis of the interface modification layer of any one of claims 1 to 7, and is characterized by comprising the following specific steps:
step one, continuously sputtering and depositing an electrolyte thin film (LiPON) based on the sample obtained from S4, wherein the thickness of the electrolyte thin film is 0.5-1.5 mu m;
based on the sample obtained in the step one, evaporating and depositing a Li cathode film by taking a high-purity metal Li sheet as a raw material, wherein the thickness of the cathode film is 0.5-1.0 mu m;
and step three, based on the sample obtained in the step two, taking the metal Cu particles as a raw material, and evaporating and depositing the Cu film as a negative current collector to finish the preparation of the miniature all-solid-state film lithium battery.
9. The method of manufacturing a thin film lithium battery of claim 8, wherein: the method for depositing the electrolyte film in the first step comprises the following steps: high purity Li by radio frequency magnetron sputtering3PO4As target material, the sputtering gas is high-purity N2The working pressure is 0.2Pa, and the sputtering power is 80W.
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| CN114335439A (en) * | 2021-12-30 | 2022-04-12 | 中国工程物理研究院电子工程研究所 | Method for preparing high-crystallization thin film electrode and thin film battery through plasma induced growth |
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